Why whenever i click on newly added menu item, it somehow navigates to its child menu url instead of showing other child menu's item?

https://world.episerver.com/documentation/developer-guides/CMS/user-interface/extending-the-navigation/adding-and-configuring-menu-items/

I use the code form the above link present in example 4(New global menu section.).

I just only changed the url of the child menu's item and it is not working as it is showing in example 4 view.